#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<cstdio>
#include<cmath>

using namespace std;

int main()
{
	int R;
	cin >> R;
	printf("VOLUME = %.3lf", (4 / 3.0) * 3.14159 * pow(R, 3));
	return 0;
}